There are a couple abilities that only Unseen are able to get from gambling, and these two are both in that list.
Although that list only existed due to Mastermind having Gamble prior to FoL changing Mastermind to allow it to inherit the day and night ability of a class of its choice. they copied us
Although in this theoretical case, the Fools wincondition would make outting scum practically gamethrowing anyway
As stated in the OP (around where Altar Time is discussed):
In this case, the Timesnatcher would get Time Snatch and not Dark Dimension, as Altar Time would be in the Chronomancers first (and only) slot.